1

MU524 Vari-Mu Tube Compressor / Re: No AC volage from TP1 on

« on: May 29, 2023, 12:35:27 PM »

...after turning the input transformer in the right position, everything works as expected. Carefully reading the instuctions is helpful 

2

MU524 Vari-Mu Tube Compressor / Re: No AC volage from TP1 on

« on: May 28, 2023, 09:18:15 PM »

...think, I found out: Input transformer needs to be turned 

I'll be back soon.

3

MU524 Vari-Mu Tube Compressor / No AC volage from TP1 on

« on: May 28, 2023, 11:40:57 AM »

Hi,

my MU524 fails from setup guide #6:

- DC voltages are present:
+/-16V, 48V B+, 33V @TP1+2

- Heaters are on 6.2V

- AC 1V/1kHz is at the in-/output when in bypass

- At "In"-pos. no AC voltage at all regarding TPs and output

I measure a short to ground from both grids and also across C4/R5 I think, this should measure at least some kOhms. Soldering seams clean.

Any ideas? Regards
Claus